Syringe.



PTENTED APR. 4, 1905.

F. WAGKBNHUTH.

SYMNGE,

APPLIGATIQN FILED DEG. lIS.V 1903 m m m w ATTORNEYS L@ FREDERICK lVACKENHUTH, 'OF NEXV YORK,

Patented April 4, i905.

rl. r.

SYFlNGE.

dated. April 4i, 190

Applicatior lile December 16, 1903. Serial No. 185,386.

To all whom it may concern:

Be it known that I, Frinnnnioii Licitan- HUTH, a citizen of the United States. and a resident of the city of New York, borough. ot Manhattan, in the county and State of New York, have invented a new and Improved Syringe, ot' which the Jr'ollmving is a full, clear, and eX- act description.

This invention relates especially to hypodermic syringes, although certain features ot' my invention could be readily applied to syringes of other types.

The invention iies in certain improvements in the form and construction ot' the syringe, all of which will be fully brought out hereinafter.

This specification is an exact description of one example of my invention, while the claims define the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification.l in which similar characters of reference indicate corresponding parts in all the views.

Figure l. is a side elevation or' a syringe with parts broken away. Fig. 2 is a section on the line 2 2 ot Fig. 1. Fig. 3 is a section on the line 3 3 of Fig. 2. Fig. ef is a detail perspective view ot the combined packing and gland. Fig. 5 is a detail section of the hypo-- dermic eedle. Fig. 6 isa section olI the bushing employed in connection with the needle. Fig. 7 is a plan View or' theblank for the linger-piece. Fig. 8 is a plan view of the fingerpiece, and Fig. 9 is a detail view of a niodi'rication in the piston.

Referring to Figs. l to 3, the cylinder r/y is ot' glass and has at one end an integral stuffing-box c and at the other end a nipple (t2, which is provided interiorly with a tapered bore ground true by suitable devices, for a purpose which will hereinafter appear. indicates a glass plunger-rod or piston having at its outer end a ring b for facilitating its operation. rihe interior surfaces ol the cylinder c and the sides ot' the plunger-rod 7J are ground to approximately an accurate engagement; but this engagement is not hermetic, my invention involving means for effecting a hermetic connection between the cylinder and piston at the outer end thereof, and thus avoiding the expense and diiiicnlty of grinding the piston and cylinder mathematically true, as has heretofore been done with a certain class of syringes well known on the market. The-se devices comprise a combined packing and gland c, formed ot' soft rubber and comprising an outer flange lying against the outer end of the smiling-box r1. and an inner cylindrical part .encircling the rod 7). Said inner cylindrical part forms the packing proper and is provided with an annular slit e', which communicates with the interior oi' the cylinder. Now it is clear that when the pressure within the cylinder enters the said annular slit c the packing is spread inward and outward, thus binding' it against the sides ot the piston-rod and also against the sides of the stuhng-box, whereby leakage both through and past the packing is prevented.

The combined gland and packing is held in place byrneans of a cap (Z, ot' metal, hard ruhber, or any desired material, said cap iitting over the rod 7) and being internally threaded. as shown in Fig. 2. These threads of the cap (Z engage the curved tongues d, carried on a. collar e, having the linger-piec.` e2 projected therefrom between the tongues c'. Fig. 7 shows the blank from which the parts c, d, and @i made. This blank is stamped or otherwise produced Vfrom a single sheet or' metal, after which the tongues e are bent up and curved in the are of circle corresponding with the cap (Z and externally threaded. The collar is then drawn over the cylinder and bears against the shoulder formed by the staining-box u", all oi? the parts being drawn snugly together by the action ot the cap and the tongues e', as will be understood.

j" indicates the hy podermic needle.v to which a sleeve 0, preferably olt brass, is soldered or otherwise fastened, as shown, this sleeve encircling one end or the needle and being provided with externally-threaded ends. g indicates a {lange formed on the sleeve to iacilitate turning the same. The threaded sleeve f/ is adapted to screw into a bushing It, which is tted to the bore in the nipple c2. This bushing /i is formed, preferably. ot' hard rubber, and when the parts (j and t are engaged Y together, as shown, the bushing /e/ 1s wedged tightly within ille nipple thus n'niliingi' n.v l

hermetic connection.

oi my ii'niention, it will he oherved thet- Shonld the needle brezil: nt :my time it is only neeeeezn'f/ to unseren the Sleeve f/ vfrom the hnsshing /znnd applyniiewneedle. ilhehnshing' /2l nin); he removed et any time "or the 'purpose ot' Cleaning' or peeking the Syringe and also to permit the introdnetion into the ejflinder ol." the syringe ol the medicine to he injectedE A medil'ied 'Forni el in v invention Shown in Fig. 9 eoniprehende the nee oll n. inetilllie rod fi and e 'piston of :sollt rnhher or its equiv: lent. This pieton ie ni'e'lferzihlyvnlennizefl on pine or llnnges l, nttziehed to the rod :ind Seid pieton has an :innuler slit tlnn'ein, forming' e Vflexible annuler lip, which under the fluid-pressure within the evlinder is vl'oi'eed ont against the inner wells ol the cylinder, and thne n. hermetic eonneetion liet-.veen the two ie effected.

Vz'iiions elning'ee in the forni.l proportions, and niinor detalle of :ny invention may be ren sorted to :it spirit sind scope tl'iereo'l". myself entitled to :ill Sneh variations ne lie within the intent of nrv elninie.

llnvii'igg' thns described my in vontioin l elziini ne new :nid desire to eeenre. h v Letters fl?ntent-- i. lin n Syringe, eol'tonhher rnenibei ConetingY with the eyliijider und rod, end hnvinn; nn in'innlerffslit therein Vforming' ini zini'nilzn' ll hle lip adapted to he l'oreed ont hy the llnidpressure within the syringe.

ln, n syringe, n neckline' ring' or Sleeve Vfornne ot' soft rnhher or its equivalent, end having en annuler slit therein yn'odneing' two in'innlzir linen-.dented to he Spread inert h3' the 'lli'iid-preesnre within the cylinder no ne to h nn' he 'n'ietienlly against lngith the rod :i nd cylinder.

.il syringe, having) n. liijreer-nieee eoinprieing' :iring, e lingerniece proper, two y:iep- :i 'nte longilindin{illy-projected line, ene a ein) having` connection with the line el. il Syringe, having' i linger-piece oomprising n. ring, :i linger-niece proper, :ind two Separate opposite-l);situated longitudinzilly- Hence l Consider may will without departing' from the l Concerning thin wirt een heving' t lips. l

A syringe having' iieylinder, n rod worli ing' throne'h one end thereof, e peeking' noting between the cylinder and red nt Seid end ol'l the cylinder, Seid end et the cylinder being enliirgeffl to receive the peeking., n een serving to hold the iizielingin place, and n linger-piece en ;,i'nged with the enlargement et the cylinder and Connected with the Cep to hold the een in niece.

G.' er s vrii'ige having Cylinder provided with an enlzn'iren'ient itoin'iing n, stelling-box, e rod .vorliingf through the enlargementa n, peeking in the enlargementq e lingenpiece Comprising :i ring, n lingerepiece proper sind extending' lips having' Ll'n :ids thereon, :ind n t sided enen .freinent wi th the Seid In "o :i proieetinglip, the Seid ring encircling the cylinder and engaging' the enlargement :ind the lin extending' longitudinally et' the evlinlder alongside of the enlargement, end n 'ineens 'for holding the peeking' in place.

il. ingeri-nieeefor Syringes eoinprising'e ring', i. linger-niece proper projecting therelronl. :ind two spaced lips projecting' frein the ring :ind :idznited to extend nlongsiee the Syringe-Cylinder longitudinally there/ol.

EL linger-piece torsvringes eeinprising n ring, n linger-@ieee proper projecting' therefrein.A and twoeiimeed lips projecting lrorn th ring' :ind ndnpted to extend alongside the Syringe--eyliinler longitudinally thereof, ell oiz the ierteo'l the lingewpieee loeingg` Struck up from nn integral plete ol.E motel.

Qf .[lieyring'e having' :i glass cylinder, n glass red wor ling' therein and 'forming' n, plunger- 'piston, seid parte having' their opposing Snrlneee formed to nppr'xiinetely trne Content, :ind n peeking' noting between the cylinder and rod to 'form e hermetic Connection.

ln testimony whereof l have Signed 'my neme to this Speeilieetion .in the prefeenee ot two sul)n eerihing witneseee.

FRE fEl'tlUl iVfiUlililliU'lfl.

illitnesees:

Leni/io l. inventif, JNO. M. ltrififni-z. 

